Applicable

(Y)es / (N)o

(C)onfidentiality

(I)ntegrity

(A)vailability

RPN

(C+I+A)

(S)atisfactory

L1

M2

H3

L1

M2

H3

L1

M2

H3

(O)ther than satisfactory +##

sc-20

secure name / address resolution service (authoritative source)

assessment objective:

Determine if the information system:

sc-20(a)

provides additional data origin and integrity verification artifacts along with the authoritative name resolution data the system returns in response to external name/address resolution queries;

sc-20(b)

provides the means to, when operating as part of a distributed, hierarchical namespace:

sc-20(b)[1]

indicate the security status of child zones; and

sc-20(b)[2]

enable verification of a chain of trust among parent and child domains (if the child supports secure resolution services).

potential assessment methods and objects:

Examine: [select from: System and communications protection policy; procedures addressing secure name/address resolution service (authoritative source); information system design documentation; information system configuration settings and associated documentation; other relevant documents or records].

Interview: [select from: System/network administrators; organizational personnel with information security responsibilities; organizational personnel with responsibilities for managing DNS].

Test: [select from: Automated mechanisms supporting and/or implementing secure name/address resolution service].